You need to put your reindeer, balthazar, rudy, jebediah, and ezekiel, in a single-file line to pull your sleigh. however, ezekiel and jebediah are best friends, so you have to put them next to each other, or they won't fly.
how many ways can you arrange your reindeer?

12

Step-by-step explanation:

Given

Balthazar,Rudy,Jebediah and Ezekiel in a single-File line to pull sleigh

Jebediah and Ezekiel Stay together

i.e. we need to arrange three person considering Ezekiel and jebediah as Single person

therefore 3 person can  be arrange in 3! ways =6

and also Ezekiel and Jebediah can be arranged in 2 ways

Therefore a total of ways are possible

12

Step-by-step explanation:

Found answer on Khan Academy. :p